Dean laughed at Sam's words and pressed up against him, deciding he really did like this intimacy they were building up between them. It was like pieces falling into place and he was thoroughly amused at it taking this long to get here. He knew he'd do the whole self-loathing thing when they were done, kick himself for a week or so, and they'd do that emotional talking crap and get over it, but for now he was happy to just enjoy it all.
"Well, hey, it's not the first time one of us has been inside the other." He snorted his amusement, consider he'd sat in car-Sam and he'd put his arm inside Sam when they were ghosts. Except then Sam was doing things to himself and Dean let out a little groan at the sight of it. Okay, yeah, that was hot. But he'd geared himself up for this plan and he kissed his way along Sam's jaw to his ear, sucking on the earlobe.
"What're you doin', huh? I thought you'd wanna get your chance to fuck me. Payback for all the crap I've given you over the years," he teased him, sliding his hands down to grip Sam's ass firmly. "How about you screw me first, then if you're not totally beat, I'll give you the best fuck you've ever had," he murmured in his ear, his voice dripping in sex and lust.
As much as he was unprepared and nervous, he actually really wanted to be fucked. If there was anyone he trusted to do this with, it'd be Sam.